Singularities on the brane are not isotropic

Bruni, Marco; Dunsby, Peter K S

Singularities on the brane are not isotropic

Journal Article

2002

Journal Title

Physical Review D - Particles and Fields

Link to Journal

https://dx.doi.org/10.1103/PhysRevD.66.101301

Department

Department of Mathematics and Applied Mathematics

Faculty

Faculty of Science

Abstract

Recent studies of homogeneous anisotropic universe models in the brane world scenario show that the cosmological singularity in this context is isotropic. It has therefore been suggested that this may be a generic feature of singularities on the brane, even in the inhomogeneous case. Using a perturbative approach, we show that this is not the case. As in the GR case, the presence of decaying modes in the perturbations signal the instability (in the past) of the isotropic singularity. The brane universe is therefore not born with isotropy built in: as in standard cosmology, the observed large-scale isotropy and homogeneity remains to be explained

Keywords

Cosmology and Gravitation

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